Voluminous filament yarn and process to prepare same

ABSTRACT

Object of the invention is a process for preparing a voluminous filament yarn with several loose filament ends sticking out by means of false twist texturization, optionally combined with a drawing process including the use of filaments having-at least partially-a flex abrasion resistance of less than abt. 1500 revolutions, said filament yarns being fed into known false twist texturizing devices and texturized therein, whereby the filaments having flex abrasion resistance values of less than abt. 1500 revolutions break in irregular intervals due to the transversal stress applied within the texturization area, the thus obtained loose filament ends sticking out being interlaced, at least temporarily, by a process for ameliorating filament bonding as well as the voluminous filament yarns produced accordingly. The process allows of the trouble-free preparation of filament yarns being optionally texturized, having several loose filament ends sticking out, which excel in the uniformity of their characteristics all over the yarn length and which may be worked up to fabrics having an extremely low tendency to pilling.

United States Patent 1191 Cardinalet al.-

[ VOLUMINOUS FILAMENT YARN AND PROCESS TO PREPARE SAME [75] Inventors:Jutta Cardinal, l-lofheim, Taunus,

Karl Heinrich; Gunther Bauer, both of Bobingen, all of Germany [22]Filed: July 10, 1973 21 Appl. No.: 378,018

[30] Foreign Application Priority Data Feb. 19, 1973 Germany 2308031 [52US. Cl. 57/157 R, 57/140 R, 57/157 TS, 7 57/157 5 [51 Int. (:1 D02g3/00, D02g 3/34 [58] Field of Search 57/140 BY, l57 TS, 157 R, 57/157 F,157 S, 140 R, 2

1451 Dec. 31, 1974 8/1968 Port et al. 57/157 TS X l/l970 Asaka 57/157 TSPrimary Examiner-John W. Huckert Assistant Examiner-Charles GorensteinAttorney, Agent, or Firm-Connolly and Hutz [5 7 ABSTRACT Object of theinvention is a process for preparing a voluminous filament yarn withseveral loose filament ends sticking out by means of false twisttexturization, optionally combined with a drawing process including theuse of filaments having-at least partially-a flex abrasion resistance ofless than abt. 1500 revolutions, said filament yarns being fed intoknown false twist texturizing devices and texturized therein, wherebythe filaments having flex abrasion resistance values ofless than abt.1500 revolutions break in irregular intervalsrdue to the transversalstress applied within the texturization area, the thus obtained loosefilament ends sticking out being interlaced, at least temporarily, by aprocess for ameliorating filament bonding as well as the voluminousfilament yarns produced accordingly. The process allows of thetrouble-free preparation of filament yarns being optimally texturized,having several loose filament ends sticking out, which excel in theuniformity of their characteristics all over the yarn length and whichmay be worked up to fabrics having an extremely low tendency to pilling.

8 Claims, 2 Drawing Figures VOLUMINOUS FILAMENT YARN AND PROCESS TOPREPARE SAME Therefore, processing methods have already been developedwhich are supposed to allow the preparation of filament yarns with loosefilament ends out of ordinary filament yarns, while avoidingnevertheless the cutting of synthetic continuous threads (filaments) tostaple fibers and their subsequent secondary spinning.

German Offenlegungsschrift" l 660 606 describes a process for preparingsuch fluffy yarns, which me-- chanically rips and unravels the surfaceof a drawn filament yarn by rotatingbrushes. But this process is limitedto foamed thermoplastic polymers and, obviously, it is applicable tocoarse yarns only.

According to British Patent 924 086 it is said to be possible to jointlydraw filaments of different elongation in such a way that one of thecomponents breaks and thus results in the loose ends looked for.

British Patent 971 573 claims a similar process, wherein two yarns ofdifferent elongation-at break are jointly submitted to a simultaneousstretching and texturizing treatment, and whereby the drawing proportionmust be set in such a manner that the breaking filaments are those ofthe yarn having the lower elongation at break. Though this processresults in a fluffy yarn with several loose filament ends sticking out,it is, however, still ridden by a series of disadvantages. Since theeffect looked for can be attained only by elongation, a portion of thefilaments up to their breaking point, the yarn tension within thetexturizing area cannot be chosen according to the optimal crimpingproperties. The yarn tension is predetermined already by the requirementof breaking one of the components.

When practicing a simultaneous drawing and texturizing process, theelongation occurs at the beginning of the heater device of the usedfalse twist texturizing apparatus. Due to the fact that this knownprocess causes a portion of the filaments to break withinthe drawingzone, the loose ends jam the twister of the texturizing device again andagain. Besides these processing difficulties, the treatment includesstill further disadvantages according to the statements of BritishPatent 971 573: A filament does not break before being overstretched toan accordingly high extent, the area immediately adjacent to the break,however is not picked up right away by the pre-stretch godet, so that itremains unstretched or, at most, only partially stretched over'a certainlength. As a matter of fact, an irregular adsorption of dyestuff is theunavoidable consequence of an irregular stretching treatment, so thatthe woven or knitted fabrics made of these yarns show an unevencoloration. Furthermore, the filament yarns with several loose filamentends prepared as per British Patent 97] 573 show a strong tendency topilling, such as itis known from spun fiber yarns made of synthetichighpolymers.

Therefore, it is the object of the present invention to develop anoperationally safe process for preparing voluminous filament yarns withseveral loose filament ends sticking out, whereby the filaments of theyarns display uniform characteristics all over their length and wherebythe crimping properties may be freely set depending on the applicationfield of the yarn. The thus prepared fluffy yarns should also be usablefor the formation of fabrics excelling in their extremely low tendencytopilling.

This problem could be solved by the application of a false twisttexturation treatment, optionally combined with a drawing process,dealing withfilament yarns where at least a portion of the usedfilaments have a flex abrasion resistance of less than abt. 1500 revol.;The filament yarns to be treated are fed into known false twisttexturizing apparatus and texturized, whereby the filaments having thelower flex abrasion resistance are breaking in irregular intervals dueto the i the invention all continuous filaments may be used thatconsist, at least partially, of filaments either having initially asu'fficiently low flex abrasion resistance of less than 1,500 revol., orthe flex abrasion resistance of which may be brought down to this levelby known methods. Best suited are filaments which have a flex abrasionresistance of less than abt. 1000 revol. and especially those of lessthan 500 revol. The value of the flex abrasion resistance influences thenumber of the loose filament ends sticking out which are produced incourse of the process as per the invention, whereby the filament havingthe lower flex abrasion resistance does break easier while being exposedto the transversal stress of the texturizing area. However, the numberof the loose filament ends may also be influenced by setting the portionof filaments with a lower flex abrasion resistance used in the totalfilamentyarn. Depending on a reduction of the flex abrasion resistance,the tendency to pilling of the woven and knitted fabrics is alsodecreasing substantially; however, as the term flex abrasion" alreadyimplies, it is not normally possible to produce or to use practicallyuseful filament yarns having a flex abrasion resistance of e.g. Zero.But is is possible to use filaments having a flex abrasion resistance ofeg as little at 5 revol. in cases, where especially strict requirementsare set up concerning the lack of tendency to pilling of certain orknitted fabrics.

Measuring the flex abrasion resistance is executed by means of the flexabrasion device as described, for instance, by Grunewald in Chemiefasern12 (1962), pg. 853. By revol, i.e., revolutions, are used herein ismeant cycles. This is clearly understood to one skilled in the art, andalso from theproperfy of flex abrasion resistance in connection withwhich the term is used tained fro m synthetic highpolymers by usingpolymerizates with a sufficiently low molecular weight; as examplesy,.l?99 .h9 aptqd st assp d nst ljeutsche Auslegeschrift 1278688. In thecase of threads made of polyethyleneterephthalate, for instance, thefollowing proportions between flex abrasion resistance and averagemolecular weight could be found: A flex abrasion resistance of 1,500revol. is

linked to an average molecular weight abt. 12 500,-

whilst flex abrasion resistance values of less than revol. may be linkedto average molecular weights of abt. 8,000. Polyethyleneterephthalatethreads having so low a molecular weight cannot bemelt-spun any longerat an economically reasonable rate due to the low melt'viscosity of thepolymers, but they may be prepared of polymers according to GermanAuslegeschrift 1237 727, Deutsche Auslegeschrift 1273 123 or DeutscheAuslegeschrift 1720 647.

Threads of linear polymers which may partially be treated in apermanently cross-linked fashion can as well have a reduced flexabrasion resistance. Therefore, same are also well suitable for beingprocessed according to the invention, within the said ranges of flexabrasion resistancevalues.

Depending on the application, all of the filaments of the filament yarnmay have the lower flex abrasion resistance of less than 1,500 revol.looked for, so that they may yield filament ends or only a portion ofthe filaments does possess these properties, while the rest shows a highflex abrasion resistance so that it does not break while being exposedto the transversal stress in the texturization area. In the first case,the filaments have to be interlaced slightly tighter for attaining asufficient strength of the yarn, whilst in the latter case thecontinuous filaments guarantee anyway a sufficient strength of the yarn.Filament yarns composed in the proportion of 7:3 to 3:7 of filamentshaving a lower flex abrasion resistance (less than 1,500 revol.) blendedwith filaments having a flex abrasion resistance of 1,500 and higher(e.g. 3,000 revol.), formed woven and knitted fabrics which excelled ina particularly attractive appearance and remarkable wear. It is alsopossible to choose freely depending on the specific application fieldthe titer and the profile of the filaments, as well as the number of thefilaments, which means the total titer of the filament yarn. In most ofthe cases the titer will remain within the range of from 1 to 15 dtexper filament and below 300 dtex for the yarn, as it is usual for textileapplication purposes, but it may as well be set at a higher level forspecial purposes such as decorative fabrics. The upper limit is, atmost, given by the texturization process. ln case that differentfilaments are worked up into one yarn, their titers and cross sectionsmay differ as well, of course. In case that the filaments are also madeof different raw materials, their various characteristic may well beutilized for further effects, such as different shrinkage orbicomponeat-threads may result in additional bulk effects, differentadsorption of dyestuffs may lead to mixture yarn or coloured twist yarneffects or the use of flame-proof or flame-retarding yarn components mayproduce filament yarns of ameliorated flame resistance. On the otherhand, it is alsopossible to modify the dyeing qualities of the filamentsin an appropriate manner so that uniform coloration may take place.Since the process according to the invention draws the filaments evenlybefore breaking them, a uniform coloration all over their lengthincluding the loose filament ends is guaranteed, in contradiction to theknown processing methods which provoke the breaking of the filaments byover stretching same in the stretching area.

A preferred embodiment of the invention are voluminous filament yarns ofcomponent blends. which show different individual titers and the loosefilament ends of which are formed by the yarn component having thelowest individual titer.

Generally, it is useful to blend the individual components whenprocessing filaments into one filament yarn. This blending may takeplace, depending on the specific conditions, in anyone of the differentprocessing stages. For example, both of the two kinds of filaments maybe spun by means of one same spinning nozzle, or of two adjacentspinning nozzles, such as described by British Patent 1208 801. But itis also possible to ply the various types of filaments while passing thestretching area. A better blending may, in any case, be encouraged byinterlacing or applying an electrostatic charge.

When choosing the false twist texturization according to the process ofthe invention, the usually preferred devices are false twist spindles,since the turning around on the spindle favors even better the formationof filament ends than the torsion stress alone occuring during thefrictional texturization. The number of the loose filament ends is alsoinfluenced, for instance, by the texturization parameters temperature,yarn tension upstream and downstream the spindle, coating product,number of spindle revolutions, travel speed of the yarn as well as bythe shape and surface characteristics of the spindle. 1

Breaking of the filaments with reduced flex abrasion resistance takesplace in irregular intervals under application of the usualtexturization parameters, but the result is an even and not periodicaldistribution of the loose filament ends all over the total length of thefilament yarn. In contradiction to the afore said, the hitherto knownprocessing methods for the preparation of fluffy yarns, which induce thefilaments to break by overstretching while being drawn, easily causes aplurality of filament ends to break simultaneously and thus leads atleast to an irregular accumulation of the loose filament ends stickingout. All the filament yarns that may be submitted to a false twistprocess while being texturized are suitable for use in the processaccording to the invention. These yarns may be composed, i.e., ofhighmolecular polyamides, polyesters, polyolefins, polyacryl-nitriles,celluloses or threadforming copolymers or derivatives of thesematerials.

A preferred embodiment of the invention for producing filament yarnsconsisting of polyester filaments is the simultaneously executed drawingand texturizing process of undrawn spinning materials (threads), wherebyespecially the use of undrawn, pre-orientated polyester filamentsaccording to the U.S. Patent application Ser. No. 338,312 may giveoptimal texturization results.

The drawing proportion, that is the proportion of the initial speed tothe final speed of the yarns in the false twist texturization apparatushas to be chosen so as to draw all the filaments completely. Whendifferent filaments are utilized, efforts have to be made by the choiceof different pre-orientations to adapt, as far as possible, the drawingproportions of all filaments to each other. This is the only possibilitythat guarantees the all-over uniform drawing of all the filaments over5. their total length, and thus to guarantee an even adsorptionofdyestuff.

The process according to the invention does not insist in imparting tothe fed-in spinning yarns a flex abrasion resistance of less than e.g.1,500 revol. already be fore the combined drawing and texturization, incase that undrawn or partially drawn filament yarns are utilized.However, the reduction according tothe invention of the flex abrasionresistance of at least one titer of the filaments cannot be dispensedwith at the moment of the yarn reaching the twister of the used falsetwist device. After being texturized the broken fil ament ends arepartially still sticking out far of the filament yarn, so that they haveto be interlaced at least temporarily before being submitted to furthertreatment. For this purpose are suitable all known process methods foramelioration of the filament bonding such as treatment by sizing ortwisting of the yarn.v But in general the application of a twist ontothe fluffy filament yarn is not so much preferred, since this high costimplying processing step is responsible for a loss of volume of thefilament yarns. A preferred method for ameliorating the filament bondingis to interlace the threads immediately after their having left thefalse twist texturization. Theinterlacing by gas-blasting replacesgenerally more and more the twist process when preparing syntheticthreads, since this gas-blasting may take place at high turnover speedsand continuously following other processing stages. U.S. Pat. No. 2985995 e.g. describes interlacing devices. The open structure of thevoluminous filament yarns may well be entirely preserved, if interlacingof the filament ends may be produced by application of a size which canbe washed out again after weaving or knitting.

The voluminous filament yarns with loose filament ends sticking outaccording to the process of the invention show their superiority incourse of their further treatment especially by the high degree oflevelness of all their textile technological properties-all over thelength of the yarn. These yarns display a distinctly higher volumecompared to the usual texturized filamentyarns having also aconsiderably higher covering power. Therefore, it is possible to producethe same individual impression of a specific material already at anoticeably reduced weight per square meter. However, the most remarkablequality of the fabrics formed by the filament yarns of the invention istheir extremely low tendency to pilling.

The known high tendency to pilling of spun fiber yarns made of syntheticfibers could be checked and brought down to an acceptable level bydeveloping socalled low-pilling types of fibers (cf. to this subjecte.g. P.Braun, Chemiefasern/Textilindustrie 1972, pg. 537 to 540"). Itwas found, surprisingly, that the yarns according to the inventiondespite their great volume and the general lack of yarn torsion could beworked up to fabri'cs, the tendency to pilling of which did not evenreach that of the most pill-lacking spun fiber yarns known to the art.

The tendency to pilling of surfaces was tested by the Random TumblePilling Tester (cf. e.g. Baird, Legere, Standley in Textile ResearchJournal 26 (1956), pg. 731 and ASTM standards on textile materials 1961,pg: 552). The tendency to pilling was evaluated visually by applicationofReutlinger Pillgrade" (synopsis of. e.g. Grunewald in Chemiefaser 12)1968, pg. 936).

The flex abrasion resistance was determined, as said before, by means ofa flex abrasion device, whereby the filaments to be examined are loadedwith 0,45 g/dtex, the diameter of the wire being 0,02 mm up to 6,7 dtex0,04 mm up to 13 dtex and 0,05 mm for even higer ti ters, flexing takesplace at an angle of 1 10 at a speed of 126 revol/min.

The following examples illustrate the invention:

EXAMPLE 1 a 67 f40 was prepared similar to example 1 of GermanAuslegeschrift l 720 647, whereby the 2,4 g of zinc acetate werereplaced by 3,1 g of manganese acetate and whereby the quantity of thetrimethoxysilanethanephosphonic acid-diethylester was increased from 48g to 72 g.

The two polymer materials were spun in one spinning nozzle according toU.S. Pat. No. 2 398 729 at a temperature of 290C and the spinningthreads'fed in and taken up at a speed of 1400 m/min. The relativeviscosity of the spinning threads amounted to 1,80 to 1,56. Theelongation at break of the filaments amounted to 310 percent for thecoarse titers and 375 percent for the finetiter filaments at roomtemperature, the double refractions of the filaments amounted to 9,3 or6,6- 10*.

The blended yarn obtained was submitted to a simultane ousdraw-texturization in a false twist texturizing apparatus with falsetwist spindle having a'sapphire center pin. The feed-in speed was 57m/min the output speed was 166 m/min corresponding to astretchproportion of 122,90. The yarn was first directed in thetexturization device over a contact heater 1 m long, having a surfacialtemperature of 190C, the distance between the contact heater and thespindle was 15 cm.

A false twist was imparted to the filament yarn of 2,700 revol/m. Thefilament yarn was interlaced in a gas jet after having left thetexturizing device, and then rolled up.

The obtained voluminous filament yarn showed an average of two loosefilament ends per cm of yarn length. This fact allows to estimate anaverage staple length of abt. 40 cm, considering the 40 individualfilaments of the yarn component 67 f 40. The broken filament ends showeda flex abrasion resistance of 350 revol., whilst the filaments of theother yarn component (67 f 12) showed a flex abrasion resistance of3,630 revol (in each case is given the average out of 25 measurings).

EXAMPLE 2 A filament yarn of the total titer of dtex 135 f52 accordingto example 1 had been worked up to a fabric with linen weave in warp andweft, the weight per sq.m was 106 g. The fabric was finished as usual,i.e. washed, dried, dyed minutes at C) and set (156) and then submittedin this condition to a pilling test by the Random Tumble PillingerTester. FIG. 1, line A represents the values measured.

For comparisons sake fabrics have been used made of fiber yarn, in onecase a material made of a lowpilling polyester type, whereby the usedpolymer material was that ofv example 1, (of the yarn component 67 f40);The fiber yarn with N,,, 70/1 and a twist of 980 rev/m was composed ofspun fibers having the individual titer dtex 1,7/40 mm, the flexabrasion resistance was that of the yarn component 67 f40 of example 1.This fiber yarn was worked up in the same manner to a fabric of'linenweave having the same weight per sq.m and being finished identically.The obtaining pilling line was shown with B in FIG. 1.

A further comparison was made on the basis of a fiber yarn made ofnormal polyester as per the yarn component 67f 12 of example 1. Thematerial showed approximately the same flex abrasion resistance of abt.3 800 revol., was however corresponding exactly to the aforedescribedspun fiber yarn of the low pilling type. Similar fabrics were also madeof this material and their pilling properties tested (line C in FIG. 1).

As the lines of FIG. 1 demonstrate, comparative test C under the chosentest conditions (fiber yarn made of normal polyethylen-terephthalate)shows a strong tendency to pilling, which climbs fast to value 7(heavily pilled, shape of the pill mostly ripe) during the test and thenremains on this level. Contradictory to these results, a fabric made oflow-pilling polyethyleneterephthalate-fiber yarn shows after havingpassed an initial maximum stable values of the test grade 1,

. i.e. only roughened, fluffy, fibrous (line B). Fabrics made of thevoluminous filament yarn according to the invention having individualfilament ends, at the begin-- ning of the-pilling test also shows firsta climbing line, but already one hour of test time later it dropped backZero, that means that the test fabric did not show any modificationslater on.

Double-sided circular knit goods (lap Rodier) having a weight p/sq.m ofabt. 173 g/sq.m each have also been produced of the filament yarns ofexample 1 as well as ofthe fiber yarn specified above, and submitted tocorresponding pilling tests. The pilling curves obtained for these knitgoods were exactly of the same direction as the line of FIG. 1.

The fabrics produced of the voluminous filament yarns according to theinvention showed remarkable differences concerning covering power,volume and purity of the appearance compared to those made of fiberyarns, at the same weight per square meter. All the criterions could bemuch better evaluated via the to the invention.

EXAMPLE 3 The undrawn blended filament yarn according to example l wassubmitted to a so-.called sequence texturization process. The drawing ofthe yarn occurs between two feed-in devices at speeds of 48 and 166m/min. over a pin heated to 90C.. The yarn, immediately after thedrawingprocess still entirely free of loose or broken ends, was thendirectly fed into a continuously working false twist apparatus, the sameembodiment as specified in expl. l. The yarn was charged with a falsetwist of 2,700 r/m and after having left the texturization device theyarn is treated with a sizing product of acrylic acid ethylester,acrylic acid amide and acrylic acid sodium salt for amelioration of thefilament bonding. The size coating amounted to abt. 10wt/. The obtainedvoluminous filament yarn having several loose filament ends stickingoutshowed abt. 2 filament ends per cm of yarn length.

EXAMPLE 4 According to a further operational variation of the inventionthe filament yarn had been produced in such a way, that the two blendedyarn components were spun separately, plyed in a draw'twister and thentexturized. The spun material was polyethyleneterephthalate, asdescribed in example 1, at a temperature of 290C. The yarn component forproducing dtex 67f 12 was rolled up at a melt output of 35,5 g/min at aspeed of 2 400 m/min., whilst the yarn component for dtex 67 f 40 wasrolled up at a melt output of 32,5 g/min at a speed of 2,200 m/min.

The two spinning bobbins were fed into a known draw-twister and jointlydrawn at a drawing proportion of 1:2,2 over a heated pin,'a surfacialtemperature of C and an adjacent heater plate having a temperature of C.The two yarn components were plyed on the draw-twister, the obtainedblended yarn showed a twist of 20 r/m, loose ends of individualfilaments could not be observed.

A separate measuring-of textile values showed for dtex 67f 12 a strengthof 36,5 g/tex at a torsion of 27 percent and a flex abrasion resistanceof 3,800 rev., whilst the yarn component 67 f40 had a strength of 27g/tex at 32 percent of torsion and a flex abrasion resistance of 415rev.

The blended yarn was fed into a known false twist texturizing devicewith a false twist spindle and texturized at a feed-in speed of 147,5m/min, a contact heater temperature of C and a false twist of 2,300twist per meter. At an output speed of the false twist device, beingsituated 1 percent below the input-speed, a thread tension of 25 gupstream the texturizing spindle with sapphire center pin and of 55 gdownstream the spindle had been measured. The obtained voluminous,highly elastic filament yarn showed not only a crimped, but also anexcellent fiber-like character due to the numerous loose filament endssticking out having an individual titer of dtex 1,7.

We claim:

1. Process for preparing a voluminous filament yarn with several loosefilament ends sticking out by means of false twist texturizationincluding the use of filaments having at least partially-a flex abrasionresistance of less than about 1,500 cycles, said filament yarns beingfed into known false twist texturizing devices and texturized therein,whereby the filaments having flex abrasion resistance values of lessthan about 1,500 cycles break in irregular intervals due to thetransversal stress applied within the texturization area, interlacingthe thus. obtained loose filament ends sticking out, at leasttemporarily.

2. process according to claim 1, wherein the filament yarns used consistat least partially of filaments made of thread-forming synthetichighpolymers.

3. Process according to claim 1, wherein at least part of the filamentsused have a flex abrasion resistance of less than about 1,000 cycles.

4. Process according to claim 1, wherein at least part of the filamentsused have a flex abrasion resistance of less than about 500 cycles.

5. Process according to claim 1, wherein the filament yarns used consistof thread-forming highmolecular polyesters.

6. Process according to claim 1, wherein the filament yarns used consistof unstretched or partially stretched filament yarns, being composed ofthread-forming synthetic high-polymers and wherein these filament yarnsare simultaneously stretched and false twist texturized.

7. Process according to claim 1 wherein the false twist texturization isperformed by means of a false twist spindle.

8. Process for preparing a voluminous filament yarn with several loosefilament ends sticking out by means of a drawing process carried outprior to or simultaneously with false twist texturization, including theuse of filaments having at least partially a flex abrasion resistance ofless than about 1,500 cycles, said filament yarns being fed into knownfalse twist texturizing devices and texturized therein, whereby thefilaments having flex abrasion resistance values of less than about1,500 cycles break in irregular intervals due to the transversal stressapplied within the texturization area, interlacing the thus obtainedloose filament ends sticking out, at least temporarily.

1. PROCESS FOR PREPARING A VOLUMINOUS FILAMENT YARN WITH SEVERAL LOOSEFILAMENT ENDS STICKING OUT BY MEANS OF FALSE TWIST TEXURIZATIONINCLUDING THE USE OF FILAMENTS HAVING - AT LEAST PARTIALLY-A FLEXABRASION RESISTANCE OF LESS THAN ABOUT 1,500 CYCLES, SAID FILAMENT YARNSBEING FED INTO KNOWN FALSE TWIST TEXTURIZING DEVICES AND TEXURIZEDTHEREIN, WHEREBY THE FILAMENTS HAVING FLEX ABRASION RESISTANCE VALUES OFLESS THAN ABOUT 1,500 CYCLES BREAK IN IRREGULAR INTERVALS DUE TO THETRANSVERSAL STRESS APPLIED WITHIN THE TEXURIZATION AREA, INTERLACING THETHUS OBTAINED LOOSE FILAMENT ENDS STICKING OUT, AS LEAST TEMPORARILY. 2.process according to claim 1, wherein the filament yarns used consist -at least partially - of filaments made of thread-forming synthetichighpolymers.
 3. Process according to claim 1, wherein at least part ofthe filaments used have a flex abrasion resistance of less than about1,000 cycles.
 4. Process according to claim 1, wherein at least part ofthe filaments used have a flex abrasion resistance of less than about500 cycles.
 5. Process according to claim 1, wherein the filament yarnsused consist of thread-forming highmolecular polyesters.
 6. Processaccording to claim 1, wherein the filament yarns used consist ofunstretched or partially stretched filament yarns, being composed ofthread-forming synthetic high-polymers and wherein these filament yarnsare simultaneously stretched and false twist texturized.
 7. Processaccording to claim 1, wherein the false twist texturization is performedby means of a false twist spindle.
 8. Process for preparing a voluminousfilament yarn with several loose filament ends sticking out by means ofa drawing process carried out prior to or simultaneously with falsetwist texturization, including the use of filaments having - at leastpartially - a flex abrasion resistance of less than about 1,500 cycles,said filament yarns being fed into known false twist texturizing devicesand texturized therein, whereby the filaments having flex abrasionresistance values of less than about 1,500 cycles break in irregularintervals due to the transversal stress applied withiN the texturizationarea, interlacing the thus obtained loose filament ends sticking out, atleast temporarily.